Radio receiving system



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A. H. HOTOPP, JR

RADIO RECEIVING SYSTEM Filed June 3, 1931 Aug. 30, 1932.

Patented Aug. 30, 1932 I z u ALFRED n. Horror?, m, 0E CALDWELL, NEW JERSEY, AssIGNoE 'ro winni) mimo. of f INC., OF NEW YORK, N. YWA CCRPORATION OF DELAWARE u i y f Ennio lRECEIVING SYSTEM 'Y I' ..1.1 I" .l :fit i.'

* t ffl f f -Application-ledune3, 1931. Serial-No. 541,749. il f My invention pertains in general to radio antenna and to a wired radio selective filter receiving systems and specifically relates to a system., Thisradio receiving system-isA prosystem for the selective reception of -either vided with an air-core space radio frequency i space radio or wired radio signa1s.:=. 'transformerf'andalso with an iron-coreecar- -1` "5 ,Myinvention is directed to provide a'comrier-transformer, either of which canbe -55 l mon receiving system whichwillxbe respon- -renderedeiiective for transfer of modulated sive to either space radio or wiredradio Vsighigh' f frequency energy,A depending; upon 'nals whereby a wide range of program enterwhether the system is connected -to' the entainment can be made available to-i-a user ergy collecting antenna system for reception 'io 'without undue'complicationv or multiplication ofspaceradio signals or to the selectivel 'oo of apparatus.v The frequency ranges Semrtersystemjorthe reception of wired radio .pl'oyed in space radio broadcasting are much signals.: The provision-e of aniron-core higher than those employed in. carrier 'free transformer for wired radio'use and an-,airquency or Wired.y radio.broadcasting.;:Thecore transformer' forvspace radio use incig; frequencies now commonly employed-in space creases the efficiency ofthe system sincethe o5 radiobroadcasting:arev of theorder. .of -1I9n-core transformer; is best suited'ffor v500-'1500 kilocycles, whereas carrier'. requen.'..w1red rad1o modulated-high frequency-en- 'eieS-qlsed for4 wired radio purposes are anyergy, while the air-core-transformer is best iwhere inthe supersaudibility Arange up to- 100 Sulted for space radio. modulated highfre- -"?-2`0 kilocycles. It will be evident,.then,.that apquency eiiergy.-l er1? 55.- risata-#xvi -'m -paratus especially jdesigned 4for. handling Referring to the drawing in detail, a space l i space radio frequencies will notbe aseitcenttadlo .energy='c o1lect1n g system or antenna-.1 1y-responsive tof wired -rediofrequencies. isconnected through inductance 2-to ground This is particularly true of transformers'for -3-l Antherfmdllctane 4.- -S electrO-magneti- T25 fcoupling thermionictubefcircuits in'afreceiv Gally wupled:4 t0"the'11 1dutn6 2.1 #Indllc- 4'-'IIS -ingrsystem or u ff:.,=;; --iv, :tancesif and .4-1--comprise'-an air-coreatrans- One of theobjects of my invention consists -former' for: transfer AOt: hlgliffrelencyfeni 'in' providing a radio reeevingsystem for reergy at space: radio frequencies? variable 'ception of either wired radio orA space radio OIldenSer 5 1S Connected-:in parallel :Wlth 1 -3o Signale with: a minimum numberof compo- -inductance 4 for tuning purposes.. One "side go e fnentefnn; 12s-inv; ser .ofthe inductance 4'isvconnected.' tothefwcath er'-Anotheriobjeetjeonsists in producing 'ra- -ode of a thermionic amplifier -tubesGs-fwhile d io receiving system having certain circuits the' Other Sldt. 0f? the indutan -iS-.OI} common to-both wired radio andfspace radio -neted t0 icntitt terminal 7-'1'Ai-.Se1ectve 35 signals and othercircuits individual' to space -ltel- Syftm'f 8 1S.- CaPaCltlVely "COllPledy-tO :'85 radiO-or Wired radiosignalggeff; werfi power lines-9 which c arry modulated high Afm-ther object-comprises providing a. rafrequency energy at wired radiojcarrier .fre-

-dio receiving system having two independent qufnclesw The Selectlv filter System 8 C0111.- "sourcesof radiosignalsanddiiferent transprlSeS arfljler network havmg-u pluraltyfcf g o former paths foreach Source of signalse. 1 .predetermined circuit constants for .these- 90 -ML-,accomplish the above desirable objects ',lection of programsover diierent :carrier in'a vnovel receiving system inwhich a comffequncy TaDgBS- The-putput Circuit 0f the -monswitching mechanism changes'thecir- .Selective filter system connectedtothe cuits of a radio' receiving' system from space -cathodef'o the--thermionicltube -and -tothe T45 radio .rece tionto wired radio'receptio iff-.f contact' terminal 10. as zsho'wnm' :A: movable W6 v Jh the. rawingI have diagrammatically switch -bld`e -'l1 is pivotedforenga ement.l represented one -embodiment of the radio .with either the contacttermnal'7roi1t e'coiij ,l g receiving system of my invention. -tactrterminal '110: A The". switch-' fblade r11 Mv invention contemplates providing a .connected tothefgridiofthe tliermibnicsam-v g system connected to a space radio iplier: tube? 6.1 .vThei'contactl'fis connected e100 t be" to contact 16, and contact 24 is connected to cfntact 27.

The anode of the thermionic tube 6 is connccfed to a switch blade 12 which is adapted to engage with either of two contact termnals 13 and 14;. A switch blade 15, which is adapted to engage'with either of two contact terminals 16 or 17, is connectedthroughl an .inductance 18 and battery 19 to the cathode of' the thermionic tube 6'. Another' inductance 20 is electromagnetically coupled' to the inductance 18 and is connectedain-` parallel with a variable capacitance Y21.

The inductances 18 and-20 comprise an aircore transformer which is designed especially forhandling high frequency energyv at'. frequencies lyin Withintheordinary space radiobroadcasting' range and above 500 lrilocycles.. One side of' the inductance 20 isIconnected to the cathode of'a thermionio detectortube 22 and the other-side of the inductance QO'is connected to a-switch blade 'which is adapted'to engage with either of the two'contact terminals .24 or25.- Another' switch blade 2G, adaptedt to: engage withl either of two contact terminals-.27 or 28', islconnected through-the gridcapacitance 29 and grid' leak resistance' 30 to' the' grid of thethermionic detector tube- 22..' The contacts '14 and=17 are'connected to thepri'- mary' winding' 31 of arr iron-core transI former, While the contact) terminals25 and 28- are connected to the'secondar'ywinding 32of'- the same transformer; The-iron-core transformer 31-32 is especially' designed to handle wiredl radio=carrier frequency energy within al range' below 100 lrilocycles; r1`he output of thermionicdetector tubeY 22' acts through an iron-core` audiofrequency transformer 33- to controli a tliermioni'camplifier tube` 34'." 'The output' ofL the" tube acts through an' iron-core audiofrequency transformer 35 tocontrol| a translating device such as loudspeaker 36l-f"'f When switch blades=1`2and=15 arein en'- ga ementwith contacts 13 and 16, respectively; and when switch blades 22# andflare in engagement with contacts 24 and'27, the output of vtliermionictube 6 will act through.V the air; 'core'transforrner comprising' inductances 18 and QO'to-control' the grid of the thermionic detector tube 22; When the switch blades 12 andz 15 are in engagement with contact terminal's-H' and 17 and when'switch blades 23 andQG are in engagement with contact ter'- minal's 25and 28, the output from thermionic tube-willact throughtrans-former 31-32'for controlling the thermionic'det'ector tube 22'.

The air-core transformer 18'-20willnot detract' fromthe efficiency of thel iron-core transformer 31z-32and is', therefore, leftin circuit therewith' for operation at'carrierfrequencies. An insulating bar 3'Z'i`s provi'dedffor'inter.

connecting the` switch blades 11, 12;' 15, 23, and 26^so that all of. these switch: blades-,can

i n v- .factthataminimum number of elements are employed to increase the utility ofa singe receivii'ig system for eflicientreception of either space radio orwired radio signals. Although I have shown a preferred embodiment of my inventioml do not-wish to be limited thereto except insofar as maybe pointed out in the appended'claims. u 7

Y What'Icl'aim asnew'and'original and de'-: sire to secure 'by Letters Patent of the United Statesis: .f 1 1 1'? A radioireceivingrsystem comprising, a space-radio energy collecting system, a selective filter systemxconnected to'asource of wired radio' signals, a: thermionic, amplifier tube havingian-output circuit;.means for connectingsaid amplifiertube'toeithersaid space radioenergy collecting system or to said selective lter? system, af thermionic. detector tube havingan input circuit', an air-core transformer. coupling said) amplifier-tube to said detector tube, said transformer having a secondamynand'pnimaryl an iron-core -transform en' having." a.- secondary and primary, and; means: for-'connecting the primary of- 'sa-id; iron-core transformer in. series with the priinary'of, saidrair-'core transformer in said output'circuitfand connecting the second? ary.` .ofi said.v inout-core'. transformer in series with.' the'-=secondary ofi said: air-core: transl formerinsaidnputcircuit m.: 2:1"A radio receiving system' comprising',l a space radio energy collecting system;.a 'ser lectivafiltexz'systemfconnected4 to a source of wiredV radiotsignals, a'lthermionic amplifier bibs' having' an output circuit, .az switch for connecting saidwamplier tube to either. said space radio energy collecting system orto said,r filter. system; a; thermionic idetector tube having.` aminpuhcircuit, an air-core transformerl couplingr-said amplifier tube to vsaid detector tube,said?transformerhaving-a secondary and primary, an iron-core transformerhaving'a'secondaryand primary, a switch for. connecting'the'primary. of said iron-core transformer in series'with the primary of said ain-core; transformer in saidfv output circuitgtand a. switch -folrconncctingthe secondany of said'ironrcoretransformer inseries with theD secondary ofzsaid air-core transformer im saidinput ,circuitiI and common means-tfon-mnvingall of said switches: awr.

x,.rizai .;HOTOPP,` JR.

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